mod_http_oauth2: Validate redirect URI depending on application type Per https://openid.net/specs/openid-connect-registration-1_0.html require that web applications use https:// and native applications must use either http://localhost or a custom (non-https) URI. Previous requirement that hostname matches that of client_uri is kept for web applications.

Generate a DNS UPDATE order in format suitable for `nsupdate` based on
current port configuration.

Example output:

```
$ prosodyctl mod_dnsupdate -d example.com -t xmpp.example.com example.com
zone example.com
server ns1.example.com
ttl 3600
add _xmpp-client._tcp.example.com IN SRV 1 1 5222
add _xmpp-server._tcp.example.com IN SRV 1 1 5269
```